服务器应该向客户端发送消息“Hello :: enter QUIT to exit”,然后客户端键入任何文本,服务器回显客户端的文本,在消息之前添加“From server:”。 但似乎在顺序混乱,我似乎无法找到在哪里!我整天都在这!
这是服务器的代码:
import java.net.*;
public class Server {
public static void main(String[] args) {
int nreq = 1;
try
{
ServerSocket sock = new ServerSocket (8080);
for (;;)
{
Socket newsock = sock.accept();
System.out.println("Creating thread ...");
Thread t = new ThreadHandler(newsock,nreq);
t.start();
}
}
catch (Exception e)
{
System.out.println("IO error " + e);
}
System.out.println("End!");
}
}
ThreadHandler代码:
import java.io.*;
import java.net.*;
class ThreadHandler extends Thread {
Socket newsock;
int n;
ThreadHandler(Socket s, int v) {
newsock = s;
n = v;
}
// @SuppressWarnings("deprecation")
public void run() {
try {
PrintWriter outp = new PrintWriter(newsock.getOutputStream(), true);
BufferedReader inp = new BufferedReader(new InputStreamReader(
newsock.getInputStream()));
outp.println("Hello :: enter QUIT to exit");
boolean more_data = true;
String line;
while (more_data) {
line = inp.readLine();
if (line == null) {
more_data = false;
} else {
outp.println("From server: " + line + "\n");
if (line.trim().equals("QUIT"))
more_data = false;
}
}
newsock.close();
} catch (Exception e) {
System.out.println("IO error " + e);
}
}
}
客户端代码:
import java.io.*;
import java.net.*;
import java.util.Scanner;
public class Client {
// @SuppressWarnings("deprecation")
public static void main(String args[]) {
Scanner scanner = new Scanner(System.in);
try {
Socket s = new Socket("localhost", 8080);
PrintWriter outp = new PrintWriter(s.getOutputStream(), true);
BufferedReader inp = new BufferedReader(new InputStreamReader(
s.getInputStream()));
boolean more_data = true;
System.out.println("Established connection");
String line;
while (more_data) {
line = inp.readLine();
String userInput = scanner.nextLine();
outp.println(userInput);
if (line == null) {
more_data = false;
} else
System.out.println(line);
}
System.out.println("end of while");
} catch (Exception e) {
System.out.println("IO error " + e);
}
}
}
我正在测试它,所以在我打算让客户端成为Android手机之后 - 如果可能的话 -
更新
我已将服务器代码更改为:
outp.println("Hello :: enter QUIT to exit \n");
boolean more_data = true;
String line;
while (more_data) {
line = inp.readLine();
System.out.println("Message '" + line + "' echoed back to client.");// !!
if (line == null) {
System.out.println("line = null");
more_data = false;
} else {
outp.println("From server: " + line + ". \n");
if (line.trim().equals("QUIT"))
more_data = false;
}
}
newsock.close();
System.out.println("Disconnected from client number: " + n);
并在Luis Miguel Serrano建议的Hello消息末尾添加了“\ n”,并改变了客户端如下:
boolean more_data = true;
System.out.println("Established connection");
String line;// = inp.readLine();
while (more_data) {
line = inp.readLine();
System.out.println(line);
if (line == null) {
// nothing read
more_data = false;
} else
line = inp.readLine();
System.out.println(line);
String userInput = scanner.nextLine();
if (userInput.trim() == "QUIT") {
s.close();
System.out.println("Disconnected from server.");
more_data = false;
} else
outp.println(userInput);
}
System.out.println("end of while");
现在它运作良好。
如果有人可以向我推荐一些Android客户端-java服务器教程会很感激。
答案 0 :(得分:1)
按照您的评论顺序,这可能是一个昙花一现的问题。尝试添加以下行:
outp.flush();
后:
outp.println("Hello :: enter QUIT to exit");
当您写入流时,有时您编写的内容会保留在缓冲区中。如果要确保清空缓冲区并且实际发送了字符串,则需要调用flush()方法。
更新
此外,在服务器的Hello欢迎消息的末尾添加“\ n”。我认为这会使它发挥作用。